Re: [WORKAROUND] Maps from DLC appearing twice on Overview page
I found a trigger for this duplicate world issue which I managed to repro multiple times - launching the game whilst downloading/installing a Pack in the background. For me it was in Origin but I should imagine the same could be applied to EA App too and possibly console.
To fix it I quit the game without saving, trashed the pack with the duplicate world (EP14 in my case), repaired the game then re-downloaded the pack. Repairing may not have been necessary but I did it as a precautionary measure.
I'm on a Mac, pack folders in macOS can be found in the Sims 4 Packs folder which is in the same location the base game is installed to.